Answer to Question #99296 in Electrical Engineering for Hardi Amiru Sulemana

Question #99296
An engine operating on the outo cycle has a compression ratio of 7.5:1. At the beginning of the compression stroke,the air is at 1.035bar and 27°C. If the heat energy supplied is 930Kj/kg of air, calculate; the maximum temperature and pressure in the cycle and the cycle efficiency
Expert's answer

The Otto cycle consists of four stages:

1-2: adiabatic compression;

2-3: isochoric compression;

3-4: adiabatic expansion;

4-1: isochoric cooling.

Calculate the cycle thermal efficiency (for the air at the temperature of 27°C k=1.4):

At the end of the adiabatic compression:

The pressure at 2 is

The isochoric heat capacity:

The heat energy supplied:

here is the maximum temp:

During the isochoric stage 2-3 the pressure reaches its maximum as well:

or 50.4 bar.

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